Defect structure and electrical conductivity of ThO2-Y2O3 solid solutions

Subbarao, E. C. ; Sutter, P. H. ; Hrizo, J. (1965) Defect structure and electrical conductivity of ThO2-Y2O3 solid solutions Journal of the American Ceramic Society, 48 (9). pp. 443-446. ISSN 0002-7820

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Compositions in the system ThO2-YO1.5 were coprecipitated as oxalates and converted to oxides. Disks were pressed and sintered in oxygen at 1400° to 2200° C. Densities of the sintered disks were 96 to 98% of theoretical. Solid solutions with the fluorite-type structure were formed up to 20 to 25 mole % YO1.5 at 1400° C and up to 45 to 50 mole % YO1.5 at 2200°C. Density data showed that these solid solutions correspond to Th1-xYxO2-0.5x, having a complete cation sub-lattice filled by Th4+ and Y3+ ions, and vacancies in the anion sublattice. The observed increase in electrical conductivity with increase in YO1.5content is consistent with charge transport by oxygen ions through a vacancy mechanism. Approximately 7 mole % ThO2 is soluble in YO1.5at 2200° C. Density results indicate an anion interstitial structure for the Y2O3 phase. Transference number measurements indicate that the electrical conductivities are only partly due to ions.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
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Deposited On:25 Jul 2011 10:29
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